Stretchable supercapacitor based on a hierarchical PPy/CNT electrode and hybrid hydrogel electrolyte with a wide operating temperature
Yanfang Ren,
Yunlong Liu,
Siying Wang,
Qian Wang,
Shuhong Li,
Wenjun Wang,
Xiaochen Dong
Affiliations
Yanfang Ren
Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Technology Liaocheng University Liaocheng Shandong China
Yunlong Liu
Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Technology Liaocheng University Liaocheng Shandong China
Siying Wang
Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Technology Liaocheng University Liaocheng Shandong China
Qian Wang
Key Laboratory of Flexible Electronics (KLOFE), School of Physical and Mathematical Sciences, Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing Jiangsu China
Shuhong Li
Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Technology Liaocheng University Liaocheng Shandong China
Wenjun Wang
Shandong Provincial Key Laboratory of Optical Communication Science and Technology, School of Physical Science and Information Technology Liaocheng University Liaocheng Shandong China
Xiaochen Dong
Key Laboratory of Flexible Electronics (KLOFE), School of Physical and Mathematical Sciences, Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing Jiangsu China
Abstract Hydrogel is frequently used as a solid electrolyte for all solid‐state supercapacitors (SCs) because of its liquid‐like ion‐transport property and high conformability. However, due to the higher water content, the hydrogel electrolyte undergoes inevitable freezing and/or dehydration with climate change. Herein, polypyrrole/carbon all‐solid‐state SCs (PCSCs) were developed based on a hierarchical polypyrrole/carbon nanotube electrode and a highly stretchable double‐network polymer hydrogel electrolyte with LiCl/ethylene glycol as a mixed solvent. The PCSCs showed excellent electrochemical performance and cycle stability with a wide operating temperature. The specific capacitances could reach 202.2 and 112.3 mF cm−2 at current densities of 0.5 and 3.0 mA cm−2, respectively. Meanwhile, the PCSCs showed outstanding mechanical properties in maintaining a high areal capacitance under deformations of bending and tension. The excellent water retention of the device also ensured the stable electrochemical performance of PCSCs in a wide temperature range (30–80°C), which could potentially represent a reliable application in various harsh environments.
